Study of automatic control system to maintain constant percentage SO/sub 2/ retention in a pressurized FBC. Final report sep 79-dec 80

Technical Report · Tue Sep 01 04:00:00 EDT 1981

OSTI ID:5489838

Daniel, K J; Finnigan, S D; Reinstrom, R M

The report gives results of an assessment of the feasibility of using automatic controls to maintain a constant percentage SO2 removal in a pressurized fluidized-bed boiler (PFB) system as variations occur; e.g., in coal sulfur content or sorbent reactivity. The Clean Air Act amendments of 1977 indicate that future emission standards for SO2 should be based on a percentage reduction (comparing sulfur emissions with sulfur feed). In a PFB, sulfur feed (coal sulfur content, feed rate) and sulfur removal effectiveness (sorbent reactivity, feed rate) vary continually during operation. A transient model of a PFB plant has been developed, validated, and used to assess automatic control options. The preferred control option identified in the assessment would continuously monitor the sulfur content in the feed coal, and would adjust the sorbent feed rate to maintain a constant sorbent-calcium/coal-sulfur-feed ratio. Such a system would minimize, but not eliminate, the need for excess sorbent feed to ensure that the PFB did not exceed the specified percentage SO2 reduction on a 30-day average. The required techniques to continuously monitor coal sulfur content have not yet been commercially demonstrated.

• Research Organization: General Electric Co., Schenectady, NY (USA)
• OSTI ID: 5489838
• Report Number(s): PB-82-110693
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
42 ENGINEERING
424000 -- Engineering-- Pollution Control Equipment-- (1980-1989)
AIR POLLUTION ABATEMENT
AUTOMATION
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTION PRODUCTS
COMBUSTORS
CONTROL SYSTEMS
DESULFURIZATION
EQUIPMENT
FLUIDIZED-BED COMBUSTORS
FOSSIL-FUEL POWER PLANTS
INDUSTRIAL WASTES
OXIDES
OXYGEN COMPOUNDS
POLLUTION ABATEMENT
POLLUTION CONTROL EQUIPMENT
POWER PLANTS
REMOVAL
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
THERMAL POWER PLANTS
WASTES